Re: Touch screen driver for Acer T231H1

From: Milan Obuch <>
Date: Wed, 08 Nov 2023 15:48:32 UTC
On Wed, 8 Nov 2023 15:47:32 +0100
Tomek CEDRO <> wrote:

> On Wed, Nov 8, 2023 at 11:01 AM Milan Obuch  wrote:
> > years ago I bought Acer monitor with touch screen, but did not try
> > to use it, it works for me just as an ordinary monitor. I decided
> > to give it a try now...
> > When plugged into USB port, I see just
> > kernel: ugen0.6: <AcerA Bell T231HlTouchScreen> at usbus0
> > line in console/dmesg output. Looking into usbconfig output in an
> > attempt to get some info, I see
> > # usbconfig -d ugen0.6 dump_all_desc
> > ugen0.6: <AcerA Bell T231HlTouchScreen> at usbus0, cfg=0 md=HOST
> > spd=FULL (12Mbps) pwr=ON (500mA)  
> Hey there Milan :-) Some time ago I did work with Panasonic Toughbook
> laptop touchscreen using x11-drivers/xf86-input-wacom driver [1]. You
> may also try the multimedia/webcamd [2] or sysutils/iichid [3] as the
> driver. Good luck :-)
> [1]
> [2]
> [3]

Do you have some notes from Toughbook? Just to compare...

Also, according to sample config, x11-drivers/xf86-input-wacom uses
/dev/input/event for input, I don't know how those get created. (There
are four of them.)

With webcam, I am getting

# webcamd -d ugen0.6
webcamd 4480 - - Attached to ugen0.6[0]
webcamd 4480 - - Creating /dev/input/event6

and now I see some action on touch, but it looks like some calibration
is necessary - I have two monitor setup and position set is correct in
one axis but offset in the other.

As there is USB used for connection, iichid probably is no help for me

So I am a bit better now, with single monitor setup, it would probably
work as is (a bit), so some more investigation is necessary.